Commits on Jan 8, 2021

1. safely handle existing net namespace in default network manager …

   When a client restarts, the network_hook's prerun will call
   `CreateNetwork`. Drivers that don't implement their own network manager will
   fall back to the default network manager, which doesn't handle the case where
   the network namespace is being recreated safely. This results in an error and
   the task being restarted for `exec` tasks with `network` blocks (this also
   impacts the community `containerd` and probably other community task drivers).
   
   If we get an error when attempting to create the namespace and that error is
   because the file already exists and is locked by its process, then we'll
   return a `nil` error with the `created` flag set to false, just as we do with
   the `docker` driver.

   

   tgross committed Jan 8, 2021
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